tolong jawab ya..dengan cara kerjanya

AU (BnC)
{1,2,3} U {4,5}
= {1,2,3,4,5}

Mapel : Matematika
Bab : Himpunan

A = { 1, 2, 3 }
B = { 2, 4, 5, 6, 8 }
C = { 3, 4, 5, 7 }

A ∪ ( B ∩ C )
= { 1, 2, 3 } ∪ ( { 2, 4, 5, 6, 8 } ∩ { 3, 4, 5, 7 } )
= { 1, 2, 3 } ∪ { 4, 5 }
= { 1, 2, 3, 4, 5 }